Re: [PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for DCN2

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Jan 25, 2022 at 09:21:11AM -0600, Mario Limonciello wrote:
> For some reason this file isn't using the appropriate register
> headers for DCN headers, which means that on DCN2 we're getting
> the VIEWPORT_DIMENSION offset wrong.
> 
> This means that we're not correctly carving out the framebuffer
> memory correctly for a framebuffer allocated by EFI and
> therefore see corruption when loading amdgpu before the display
> driver takes over control of the framebuffer scanout.
> 
> Fix this by checking the DCE_HWIP and picking the correct offset
> accordingly.
> 
> Long-term we should expose this info from DC as GMC shouldn't
> need to know about DCN registers.
> 
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> (cherry picked from commit dc5d4aff2e99c312df8abbe1ee9a731d2913bc1b)
> ---
> This is backported from 5.17-rc1, but doesn't backport cleanly because
> v5.16 changed to IP version harvesting for ASIC detection.  5.15.y doesn't
> have this.
>  drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)

What stable tree(s) do you want this applied to?

And what happened to the original signed-off-by's on the original
commit?

thanks,

greg k-h